sheet.go

// Copyright 2016 - 2025 The excelize Authors. All rights reserved. Use of
// this source code is governed by a BSD-style license that can be found in
// the LICENSE file.
//
// Package excelize providing a set of functions that allow you to write to and
// read from XLAM / XLSM / XLSX / XLTM / XLTX files. Supports reading and
// writing spreadsheet documents generated by Microsoft Excel™ 2007 and later.
// Supports complex components by high compatibility, and provided streaming
// API for generating or reading data from a worksheet with huge amounts of
// data. This library needs Go version 1.20 or later.

package excelize

import (
	"bytes"
	"encoding/xml"
	"fmt"
	"io"
	"os"
	"path"
	"path/filepath"
	"reflect"
	"regexp"
	"sort"
	"strconv"
	"strings"
	"unicode/utf16"
	"unicode/utf8"

	"github.com/tiendc/go-deepcopy"
)

// NewSheet provides the function to create a new sheet by given a worksheet
// name and returns the index of the sheets in the workbook after it appended.
// Note that when creating a new workbook, the default worksheet named
// `Sheet1` will be created.
func (f *File) NewSheet(sheet string) (int, error) {
	var err error
	if err = checkSheetName(sheet); err != nil {
		return -1, err
	}
	// Check if the worksheet already exists
	index, err := f.GetSheetIndex(sheet)
	if index != -1 {
		return index, err
	}
	_ = f.DeleteSheet(sheet)
	f.SheetCount++
	wb, _ := f.workbookReader()
	sheetID := 0
	for _, v := range wb.Sheets.Sheet {
		if v.SheetID > sheetID {
			sheetID = v.SheetID
		}
	}
	sheetID++
	// Update [Content_Types].xml
	_ = f.setContentTypes("/xl/worksheets/sheet"+strconv.Itoa(sheetID)+".xml", ContentTypeSpreadSheetMLWorksheet)
	// Create new sheet /xl/worksheets/sheet%d.xml
	f.setSheet(sheetID, sheet)
	// Update workbook.xml.rels
	rID := f.addRels(f.getWorkbookRelsPath(), SourceRelationshipWorkSheet, fmt.Sprintf("/xl/worksheets/sheet%d.xml", sheetID), "")
	// Update workbook.xml
	f.setWorkbook(sheet, sheetID, rID)
	return f.GetSheetIndex(sheet)
}

// contentTypesReader provides a function to get the pointer to the
// [Content_Types].xml structure after deserialization.
func (f *File) contentTypesReader() (*xlsxTypes, error) {
	if f.ContentTypes == nil {
		f.ContentTypes = new(xlsxTypes)
		f.ContentTypes.mu.Lock()
		defer f.ContentTypes.mu.Unlock()
		if err := f.xmlNewDecoder(bytes.NewReader(namespaceStrictToTransitional(f.readXML(defaultXMLPathContentTypes)))).
			Decode(f.ContentTypes); err != nil && err != io.EOF {
			return f.ContentTypes, err
		}
	}
	return f.ContentTypes, nil
}

// contentTypesWriter provides a function to save [Content_Types].xml after
// serialize structure.
func (f *File) contentTypesWriter() {
	if f.ContentTypes != nil {
		output, _ := xml.Marshal(f.ContentTypes)
		f.saveFileList(defaultXMLPathContentTypes, output)
	}
}

// getWorksheetPath construct a target XML as xl/worksheets/sheet%d by split
// path, compatible with different types of relative paths in
// workbook.xml.rels, for example: worksheets/sheet%d.xml
// and /xl/worksheets/sheet%d.xml
func (f *File) getWorksheetPath(relTarget string) (path string) {
	path = filepath.ToSlash(strings.TrimPrefix(
		strings.ReplaceAll(filepath.Clean(fmt.Sprintf("%s/%s", filepath.Dir(f.getWorkbookPath()), relTarget)), "\\", "/"), "/"))
	if strings.HasPrefix(relTarget, "/") {
		path = filepath.ToSlash(strings.TrimPrefix(strings.ReplaceAll(filepath.Clean(relTarget), "\\", "/"), "/"))
	}
	return path
}

// mergeExpandedCols merge expanded columns.
func (f *File) mergeExpandedCols(ws *xlsxWorksheet) {
	sort.Slice(ws.Cols.Col, func(i, j int) bool {
		return ws.Cols.Col[i].Min < ws.Cols.Col[j].Min
	})
	var columns []xlsxCol
	for i, n := 0, len(ws.Cols.Col); i < n; {
		left := i
		for i++; i < n && reflect.DeepEqual(
			xlsxCol{
				BestFit:      ws.Cols.Col[i-1].BestFit,
				Collapsed:    ws.Cols.Col[i-1].Collapsed,
				CustomWidth:  ws.Cols.Col[i-1].CustomWidth,
				Hidden:       ws.Cols.Col[i-1].Hidden,
				Max:          ws.Cols.Col[i-1].Max + 1,
				Min:          ws.Cols.Col[i-1].Min + 1,
				OutlineLevel: ws.Cols.Col[i-1].OutlineLevel,
				Phonetic:     ws.Cols.Col[i-1].Phonetic,
				Style:        ws.Cols.Col[i-1].Style,
				Width:        ws.Cols.Col[i-1].Width,
			}, ws.Cols.Col[i]); i++ {
		}
		var column xlsxCol
		deepcopy.Copy(&column, ws.Cols.Col[left])
		if left < i-1 {
			column.Max = ws.Cols.Col[i-1].Min
		}
		columns = append(columns, column)
	}
	ws.Cols.Col = columns
}

// workSheetWriter provides a function to save xl/worksheets/sheet%d.xml after
// serialize structure.
func (f *File) workSheetWriter() {
	var (
		arr     []byte
		buffer  = bytes.NewBuffer(arr)
		encoder = xml.NewEncoder(buffer)
	)
	f.Sheet.Range(func(p, ws interface{}) bool {
		if ws != nil {
			sheet := ws.(*xlsxWorksheet)
			if sheet.MergeCells != nil && len(sheet.MergeCells.Cells) > 0 {
				_ = f.mergeOverlapCells(sheet)
			}
			if sheet.Cols != nil && len(sheet.Cols.Col) > 0 {
				f.mergeExpandedCols(sheet)
			}
			sheet.SheetData.Row = trimRow(&sheet.SheetData)
			if sheet.SheetPr != nil || sheet.Drawing != nil || sheet.Hyperlinks != nil || sheet.Picture != nil || sheet.TableParts != nil {
				f.addNameSpaces(p.(string), SourceRelationship)
			}
			if sheet.DecodeAlternateContent != nil {
				sheet.AlternateContent = &xlsxAlternateContent{
					Content: sheet.DecodeAlternateContent.Content,
					XMLNSMC: SourceRelationshipCompatibility.Value,
				}
			}
			sheet.DecodeAlternateContent = nil
			// reusing buffer
			_ = encoder.Encode(sheet)
			f.saveFileList(p.(string), replaceRelationshipsBytes(f.replaceNameSpaceBytes(p.(string), buffer.Bytes())))
			_, ok := f.checked.Load(p.(string))
			if ok {
				f.Sheet.Delete(p.(string))
				f.checked.Delete(p.(string))
			}
			buffer.Reset()
		}
		return true
	})
}

// trimRow provides a function to trim empty rows.
func trimRow(sheetData *xlsxSheetData) []xlsxRow {
	var (
		row xlsxRow
		i   int
	)

	for k := range sheetData.Row {
		row = sheetData.Row[k]
		if row = trimCell(row); len(row.C) != 0 || row.hasAttr() {
			sheetData.Row[i] = row
		}
		i++
	}
	return sheetData.Row[:i]
}

// trimCell provides a function to trim blank cells which created by fillColumns.
func trimCell(row xlsxRow) xlsxRow {
	column := row.C
	rowFull := true
	for i := range column {
		rowFull = column[i].hasValue() && rowFull
	}
	if rowFull {
		return row
	}
	i := 0
	for _, c := range column {
		if c.hasValue() {
			row.C[i] = c
			i++
		}
	}
	row.C = row.C[:i]
	return row
}

// setContentTypes provides a function to read and update property of contents
// type of the spreadsheet.
func (f *File) setContentTypes(partName, contentType string) error {
	content, err := f.contentTypesReader()
	if err != nil {
		return err
	}
	content.mu.Lock()
	defer content.mu.Unlock()
	content.Overrides = append(content.Overrides, xlsxOverride{
		PartName:    partName,
		ContentType: contentType,
	})
	return err
}

// setSheet provides a function to update sheet property by given index.
func (f *File) setSheet(index int, name string) {
	ws := xlsxWorksheet{
		Dimension: &xlsxDimension{Ref: "A1"},
		SheetViews: &xlsxSheetViews{
			SheetView: []xlsxSheetView{{WorkbookViewID: 0}},
		},
	}
	sheetXMLPath := "xl/worksheets/sheet" + strconv.Itoa(index) + ".xml"
	f.sheetMap[name] = sheetXMLPath
	f.Sheet.Store(sheetXMLPath, &ws)
	f.xmlAttr.Store(sheetXMLPath, []xml.Attr{NameSpaceSpreadSheet})
}

// relsWriter provides a function to save relationships after
// serialize structure.
func (f *File) relsWriter() {
	f.Relationships.Range(func(path, rel interface{}) bool {
		if rel != nil {
			output, _ := xml.Marshal(rel.(*xlsxRelationships))
			if strings.HasPrefix(path.(string), "xl/worksheets/sheet/rels/sheet") {
				output = f.replaceNameSpaceBytes(path.(string), output)
			}
			f.saveFileList(path.(string), replaceRelationshipsBytes(output))
		}
		return true
	})
}

// replaceRelationshipsBytes; Some tools that read spreadsheet files have very
// strict requirements about the structure of the input XML. This function is
// a horrible hack to fix that after the XML marshalling is completed.
func replaceRelationshipsBytes(content []byte) []byte {
	sourceXmlns := []byte(`xmlns:relationships="http://schemas.openxmlformats.org/officeDocument/2006/relationships" relationships`)
	targetXmlns := []byte("r")
	return bytesReplace(content, sourceXmlns, targetXmlns, -1)
}

// SetActiveSheet provides a function to set the default active sheet of the
// workbook by a given index. Note that the active index is different from the
// ID returned by function GetSheetMap(). It should be greater than or equal to 0
// and less than the total worksheet numbers.
func (f *File) SetActiveSheet(index int) {
	if index < 0 {
		index = 0
	}
	wb, _ := f.workbookReader()
	for activeTab := range wb.Sheets.Sheet {
		if activeTab == index {
			if wb.BookViews == nil {
				wb.BookViews = &xlsxBookViews{}
			}
			if len(wb.BookViews.WorkBookView) > 0 {
				wb.BookViews.WorkBookView[0].ActiveTab = activeTab
			} else {
				wb.BookViews.WorkBookView = append(wb.BookViews.WorkBookView, xlsxWorkBookView{
					ActiveTab: activeTab,
				})
			}
		}
	}
	for idx, name := range f.GetSheetList() {
		ws, err := f.workSheetReader(name)
		if err != nil {
			// Chartsheet, macrosheet or dialogsheet
			return
		}
		if ws.SheetViews == nil {
			ws.SheetViews = &xlsxSheetViews{
				SheetView: []xlsxSheetView{{WorkbookViewID: 0}},
			}
		}
		if len(ws.SheetViews.SheetView) > 0 {
			ws.SheetViews.SheetView[0].TabSelected = false
		}
		if index == idx {
			if len(ws.SheetViews.SheetView) > 0 {
				ws.SheetViews.SheetView[0].TabSelected = true
			} else {
				ws.SheetViews.SheetView = append(ws.SheetViews.SheetView, xlsxSheetView{
					TabSelected: true,
				})
			}
		}
	}
}

// GetActiveSheetIndex provides a function to get active sheet index of the
// spreadsheet. If not found the active sheet will be return integer 0.
func (f *File) GetActiveSheetIndex() (index int) {
	sheetID := f.getActiveSheetID()
	wb, _ := f.workbookReader()
	if wb != nil {
		for idx, sheet := range wb.Sheets.Sheet {
			if sheet.SheetID == sheetID {
				index = idx
				return
			}
		}
	}
	return
}

// getActiveSheetID provides a function to get active sheet ID of the
// spreadsheet. If not found the active sheet will be return integer 0.
func (f *File) getActiveSheetID() int {
	wb, _ := f.workbookReader()
	if wb != nil {
		if wb.BookViews != nil && len(wb.BookViews.WorkBookView) > 0 {
			activeTab := wb.BookViews.WorkBookView[0].ActiveTab
			if len(wb.Sheets.Sheet) > activeTab && wb.Sheets.Sheet[activeTab].SheetID != 0 {
				return wb.Sheets.Sheet[activeTab].SheetID
			}
		}
		if len(wb.Sheets.Sheet) >= 1 {
			return wb.Sheets.Sheet[0].SheetID
		}
	}
	return 0
}

// SetSheetName provides a function to set the worksheet name by given source and
// target worksheet names. Maximum 31 characters are allowed in sheet title and
// this function only changes the name of the sheet and will not update the
// sheet name in the formula or reference associated with the cell. So there
// may be problem formula error or reference missing.
func (f *File) SetSheetName(source, target string) error {
	var err error
	if err = checkSheetName(source); err != nil {
		return err
	}
	if err = checkSheetName(target); err != nil {
		return err
	}
	if target == source {
		return err
	}
	wb, _ := f.workbookReader()
	for k, v := range wb.Sheets.Sheet {
		if v.Name == source {
			wb.Sheets.Sheet[k].Name = target
			f.sheetMap[target] = f.sheetMap[source]
			delete(f.sheetMap, source)
		}
	}
	if wb.DefinedNames == nil {
		return err
	}
	for i, dn := range wb.DefinedNames.DefinedName {
		wb.DefinedNames.DefinedName[i].Data = adjustRangeSheetName(dn.Data, source, target)
	}
	return err
}

// GetSheetName provides a function to get the sheet name of the workbook by
// the given sheet index. If the given sheet index is invalid, it will return
// an empty string.
func (f *File) GetSheetName(index int) (name string) {
	for idx, sheet := range f.GetSheetList() {
		if idx == index {
			name = sheet
			return
		}
	}
	return
}

// getSheetID provides a function to get worksheet ID of the spreadsheet by
// given sheet name. If given worksheet name is invalid, will return an
// integer type value -1.
func (f *File) getSheetID(sheet string) int {
	for sheetID, name := range f.GetSheetMap() {
		if strings.EqualFold(name, sheet) {
			return sheetID
		}
	}
	return -1
}

// GetSheetIndex provides a function to get a sheet index of the workbook by
// the given sheet name. If the given sheet name is invalid or sheet doesn't
// exist, it will return an integer type value -1.
func (f *File) GetSheetIndex(sheet string) (int, error) {
	if err := checkSheetName(sheet); err != nil {
		return -1, err
	}
	for index, name := range f.GetSheetList() {
		if strings.EqualFold(name, sheet) {
			return index, nil
		}
	}
	return -1, nil
}

// GetSheetMap provides a function to get worksheets, chart sheets, dialog
// sheets ID and name map of the workbook. For example:
//
//	f, err := excelize.OpenFile("Book1.xlsx")
//	if err != nil {
//	    return
//	}
//	defer func() {
//	    if err := f.Close(); err != nil {
//	        fmt.Println(err)
//	    }
//	}()
//	for index, name := range f.GetSheetMap() {
//	    fmt.Println(index, name)
//	}
func (f *File) GetSheetMap() map[int]string {
	wb, _ := f.workbookReader()
	sheetMap := map[int]string{}
	if wb != nil {
		for _, sheet := range wb.Sheets.Sheet {
			sheetMap[sheet.SheetID] = sheet.Name
		}
	}
	return sheetMap
}

// GetSheetList provides a function to get worksheets, chart sheets, and
// dialog sheets name list of the workbook.
func (f *File) GetSheetList() (list []string) {
	wb, _ := f.workbookReader()
	if wb != nil {
		for _, sheet := range wb.Sheets.Sheet {
			list = append(list, sheet.Name)
		}
	}
	return
}

// getSheetMap provides a function to get worksheet name and XML file path map
// of the spreadsheet.
func (f *File) getSheetMap() (map[string]string, error) {
	maps := map[string]string{}
	wb, err := f.workbookReader()
	if err != nil {
		return nil, err
	}
	rels, err := f.relsReader(f.getWorkbookRelsPath())
	if err != nil {
		return nil, err
	}
	if rels == nil {
		return maps, nil
	}
	for _, v := range wb.Sheets.Sheet {
		for _, rel := range rels.Relationships {
			if rel.ID == v.ID {
				sheetXMLPath := f.getWorksheetPath(rel.Target)
				if _, ok := f.Pkg.Load(sheetXMLPath); ok {
					maps[v.Name] = sheetXMLPath
				}
				if _, ok := f.tempFiles.Load(sheetXMLPath); ok {
					maps[v.Name] = sheetXMLPath
				}
			}
		}
	}
	return maps, nil
}

// getSheetXMLPath provides a function to get XML file path by given sheet
// name.
func (f *File) getSheetXMLPath(sheet string) (string, bool) {
	var (
		name string
		ok   bool
	)
	for sheetName, filePath := range f.sheetMap {
		if strings.EqualFold(sheetName, sheet) {
			name, ok = filePath, true
			break
		}
	}
	return name, ok
}

// SetSheetBackground provides a function to set background picture by given
// worksheet name and file path. Supported image types: BMP, EMF, EMZ, GIF,
// JPEG, JPG, PNG, SVG, TIF, TIFF, WMF, and WMZ.
func (f *File) SetSheetBackground(sheet, picture string) error {
	var err error
	// Check picture exists first.
	if _, err = os.Stat(picture); os.IsNotExist(err) {
		return err
	}
	file, _ := os.ReadFile(filepath.Clean(picture))
	return f.setSheetBackground(sheet, path.Ext(picture), file)
}

// SetSheetBackgroundFromBytes provides a function to set background picture by
// given worksheet name, extension name and image data. Supported image types:
// BMP, EMF, EMZ, GIF, JPEG, JPG, PNG, SVG, TIF, TIFF, WMF, and WMZ.
func (f *File) SetSheetBackgroundFromBytes(sheet, extension string, picture []byte) error {
	if len(picture) == 0 {
		return ErrParameterInvalid
	}
	return f.setSheetBackground(sheet, extension, picture)
}

// setSheetBackground provides a function to set background picture by given
// worksheet name, file name extension and image data.
func (f *File) setSheetBackground(sheet, extension string, file []byte) error {
	imageType, ok := supportedImageTypes[strings.ToLower(extension)]
	if !ok {
		return ErrImgExt
	}
	name := f.addMedia(file, imageType)
	sheetXMLPath, _ := f.getSheetXMLPath(sheet)
	sheetRels := "xl/worksheets/_rels/" + strings.TrimPrefix(sheetXMLPath, "xl/worksheets/") + ".rels"
	rID := f.addRels(sheetRels, SourceRelationshipImage, strings.Replace(name, "xl", "..", 1), "")
	if err := f.addSheetPicture(sheet, rID); err != nil {
		return err
	}
	f.addSheetNameSpace(sheet, SourceRelationship)
	return f.setContentTypePartImageExtensions()
}

// DeleteSheet provides a function to delete worksheet in a workbook by given
// worksheet name. Use this method with caution, which will affect changes in
// references such as formulas, charts, and so on. If there is any referenced
// value of the deleted worksheet, it will cause a file error when you open
// it. This function will be invalid when only one worksheet is left.
func (f *File) DeleteSheet(sheet string) error {
	if err := checkSheetName(sheet); err != nil {
		return err
	}
	if idx, _ := f.GetSheetIndex(sheet); f.SheetCount == 1 || idx == -1 {
		return nil
	}

	wb, _ := f.workbookReader()
	wbRels, _ := f.relsReader(f.getWorkbookRelsPath())
	activeSheetName := f.GetSheetName(f.GetActiveSheetIndex())
	deleteLocalSheetID, _ := f.GetSheetIndex(sheet)
	deleteAndAdjustDefinedNames(wb, deleteLocalSheetID)

	for idx, v := range wb.Sheets.Sheet {
		if !strings.EqualFold(v.Name, sheet) {
			continue
		}

		wb.Sheets.Sheet = append(wb.Sheets.Sheet[:idx], wb.Sheets.Sheet[idx+1:]...)
		var sheetXML, rels string
		if wbRels != nil {
			for _, rel := range wbRels.Relationships {
				if rel.ID == v.ID {
					sheetXML = f.getWorksheetPath(rel.Target)
					sheetXMLPath, _ := f.getSheetXMLPath(sheet)
					rels = "xl/worksheets/_rels/" + strings.TrimPrefix(sheetXMLPath, "xl/worksheets/") + ".rels"
				}
			}
		}
		target := f.deleteSheetFromWorkbookRels(v.ID)
		_ = f.removeContentTypesPart(ContentTypeSpreadSheetMLWorksheet, target)
		_ = f.deleteCalcChain(f.getSheetID(sheet), "")
		delete(f.sheetMap, v.Name)
		f.Pkg.Delete(sheetXML)
		f.Pkg.Delete(rels)
		f.Relationships.Delete(rels)
		f.Sheet.Delete(sheetXML)
		f.xmlAttr.Delete(sheetXML)
		f.SheetCount--
	}
	index, err := f.GetSheetIndex(activeSheetName)
	f.SetActiveSheet(index)
	return err
}

// MoveSheet moves a sheet to a specified position in the workbook. The function
// moves the source sheet before the target sheet. After moving, other sheets
// will be shifted to the left or right. If the sheet is already at the target
// position, the function will not perform any action. Not that this function
// will be ungroup all sheets after moving. For example, move Sheet2 before
// Sheet1:
//
//	err := f.MoveSheet("Sheet2", "Sheet1")
func (f *File) MoveSheet(source, target string) error {
	if strings.EqualFold(source, target) {
		return nil
	}
	wb, err := f.workbookReader()
	if err != nil {
		return err
	}
	sourceIdx, err := f.GetSheetIndex(source)
	if err != nil {
		return err
	}
	targetIdx, err := f.GetSheetIndex(target)
	if err != nil {
		return err
	}
	if sourceIdx < 0 {
		return ErrSheetNotExist{source}
	}
	if targetIdx < 0 {
		return ErrSheetNotExist{target}
	}
	_ = f.UngroupSheets()
	activeSheetName := f.GetSheetName(f.GetActiveSheetIndex())
	sourceSheet := wb.Sheets.Sheet[sourceIdx]
	wb.Sheets.Sheet = append(wb.Sheets.Sheet[:sourceIdx], wb.Sheets.Sheet[sourceIdx+1:]...)
	if targetIdx > sourceIdx {
		targetIdx--
	}
	wb.Sheets.Sheet = append(wb.Sheets.Sheet[:targetIdx], append([]xlsxSheet{sourceSheet}, wb.Sheets.Sheet[targetIdx:]...)...)
	activeSheetIdx, _ := f.GetSheetIndex(activeSheetName)
	f.SetActiveSheet(activeSheetIdx)
	return err
}

// deleteAndAdjustDefinedNames delete and adjust defined name in the workbook
// by given worksheet ID.
func deleteAndAdjustDefinedNames(wb *xlsxWorkbook, deleteLocalSheetID int) {
	if wb == nil || wb.DefinedNames == nil {
		return
	}
	for idx := 0; idx < len(wb.DefinedNames.DefinedName); idx++ {
		dn := wb.DefinedNames.DefinedName[idx]
		if dn.LocalSheetID != nil {
			localSheetID := *dn.LocalSheetID
			if localSheetID == deleteLocalSheetID {
				wb.DefinedNames.DefinedName = append(wb.DefinedNames.DefinedName[:idx], wb.DefinedNames.DefinedName[idx+1:]...)
				idx--
			} else if localSheetID > deleteLocalSheetID {
				wb.DefinedNames.DefinedName[idx].LocalSheetID = intPtr(*dn.LocalSheetID - 1)
			}
		}
	}
}

// deleteSheetFromWorkbookRels provides a function to remove worksheet
// relationships by given relationships ID in the file workbook.xml.rels.
func (f *File) deleteSheetFromWorkbookRels(rID string) string {
	rels, _ := f.relsReader(f.getWorkbookRelsPath())
	rels.mu.Lock()
	defer rels.mu.Unlock()
	for k, v := range rels.Relationships {
		if v.ID == rID {
			rels.Relationships = append(rels.Relationships[:k], rels.Relationships[k+1:]...)
			return v.Target
		}
	}
	return ""
}

// deleteSheetRelationships provides a function to delete relationships in
// xl/worksheets/_rels/sheet%d.xml.rels by given worksheet name and
// relationship index.
func (f *File) deleteSheetRelationships(sheet, rID string) {
	name, ok := f.getSheetXMLPath(sheet)
	if !ok {
		name = strings.ToLower(sheet) + ".xml"
	}
	rels := "xl/worksheets/_rels/" + strings.TrimPrefix(name, "xl/worksheets/") + ".rels"
	sheetRels, _ := f.relsReader(rels)
	if sheetRels == nil {
		sheetRels = &xlsxRelationships{}
	}
	sheetRels.mu.Lock()
	defer sheetRels.mu.Unlock()
	for k, v := range sheetRels.Relationships {
		if v.ID == rID {
			sheetRels.Relationships = append(sheetRels.Relationships[:k], sheetRels.Relationships[k+1:]...)
		}
	}
	f.Relationships.Store(rels, sheetRels)
}

// getSheetRelationshipsTargetByID provides a function to get Target attribute
// value in xl/worksheets/_rels/sheet%d.xml.rels by given worksheet name and
// relationship index.
func (f *File) getSheetRelationshipsTargetByID(sheet, rID string) string {
	name, ok := f.getSheetXMLPath(sheet)
	if !ok {
		name = strings.ToLower(sheet) + ".xml"
	}
	rels := "xl/worksheets/_rels/" + strings.TrimPrefix(name, "xl/worksheets/") + ".rels"
	sheetRels, _ := f.relsReader(rels)
	if sheetRels == nil {
		sheetRels = &xlsxRelationships{}
	}
	sheetRels.mu.Lock()
	defer sheetRels.mu.Unlock()
	for _, v := range sheetRels.Relationships {
		if v.ID == rID {
			return v.Target
		}
	}
	return ""
}

// CopySheet provides a function to duplicate a worksheet by gave source and
// target worksheet index. Note that currently doesn't support duplicate
// workbooks that contain tables, charts or pictures. For Example:
//
//	// Sheet1 already exists...
//	index, err := f.NewSheet("Sheet2")
//	if err != nil {
//	    fmt.Println(err)
//	    return
//	}
//	err := f.CopySheet(1, index)
func (f *File) CopySheet(from, to int) error {
	if from < 0 || to < 0 || from == to || f.GetSheetName(from) == "" || f.GetSheetName(to) == "" {
		return ErrSheetIdx
	}
	return f.copySheet(from, to)
}

// copySheet provides a function to duplicate a worksheet by gave source and
// target worksheet name.
func (f *File) copySheet(from, to int) error {
	fromSheet := f.GetSheetName(from)
	sheet, err := f.workSheetReader(fromSheet)
	if err != nil {
		return err
	}
	worksheet := &xlsxWorksheet{}
	deepcopy.Copy(worksheet, sheet)
	toSheetID := strconv.Itoa(f.getSheetID(f.GetSheetName(to)))
	sheetXMLPath := "xl/worksheets/sheet" + toSheetID + ".xml"
	if len(worksheet.SheetViews.SheetView) > 0 {
		worksheet.SheetViews.SheetView[0].TabSelected = false
	}
	worksheet.Drawing = nil
	worksheet.TableParts = nil
	worksheet.PageSetUp = nil
	f.Sheet.Store(sheetXMLPath, worksheet)
	toRels := "xl/worksheets/_rels/sheet" + toSheetID + ".xml.rels"
	fromRels := "xl/worksheets/_rels/sheet" + strconv.Itoa(f.getSheetID(fromSheet)) + ".xml.rels"
	if rels, ok := f.Pkg.Load(fromRels); ok && rels != nil {
		f.Pkg.Store(toRels, rels.([]byte))
	}
	fromSheetXMLPath, _ := f.getSheetXMLPath(fromSheet)
	fromSheetAttr, _ := f.xmlAttr.Load(fromSheetXMLPath)
	f.xmlAttr.Store(sheetXMLPath, fromSheetAttr)
	return err
}

// getSheetState returns sheet visible enumeration by given hidden status.
func getSheetState(visible bool, veryHidden []bool) string {
	state := "hidden"
	if !visible && len(veryHidden) > 0 && veryHidden[0] {
		state = "veryHidden"
	}
	return state
}

// SetSheetVisible provides a function to set worksheet visible by given
// worksheet name. A workbook must contain at least one visible worksheet. If
// the given worksheet has been activated, this setting will be invalidated.
// The third optional veryHidden parameter only works when visible was false.
//
// For example, hide Sheet1:
//
//	err := f.SetSheetVisible("Sheet1", false)
func (f *File) SetSheetVisible(sheet string, visible bool, veryHidden ...bool) error {
	if err := checkSheetName(sheet); err != nil {
		return err
	}
	wb, err := f.workbookReader()
	if err != nil {
		return err
	}
	if visible {
		for k, v := range wb.Sheets.Sheet {
			if strings.EqualFold(v.Name, sheet) {
				wb.Sheets.Sheet[k].State = ""
			}
		}
		return err
	}
	count, state := 0, getSheetState(visible, veryHidden)
	for _, v := range wb.Sheets.Sheet {
		if v.State != state {
			count++
		}
	}
	for k, v := range wb.Sheets.Sheet {
		ws, err := f.workSheetReader(v.Name)
		if err != nil {
			return err
		}
		tabSelected := false
		if ws.SheetViews == nil {
			ws.SheetViews = &xlsxSheetViews{
				SheetView: []xlsxSheetView{{WorkbookViewID: 0}},
			}
		}
		if len(ws.SheetViews.SheetView) > 0 {
			tabSelected = ws.SheetViews.SheetView[0].TabSelected
		}
		if strings.EqualFold(v.Name, sheet) && count > 1 && !tabSelected {
			wb.Sheets.Sheet[k].State = state
		}
	}
	return err
}

// setPanes set create freeze panes and split panes by given options.
func (ws *xlsxWorksheet) setPanes(panes *Panes) error {
	if panes == nil {
		return ErrParameterInvalid
	}
	p := &xlsxPane{
		ActivePane:  panes.ActivePane,
		TopLeftCell: panes.TopLeftCell,
		XSplit:      float64(panes.XSplit),
		YSplit:      float64(panes.YSplit),
	}
	if panes.Freeze {
		p.State = "frozen"
	}
	if ws.SheetViews == nil {
		ws.SheetViews = &xlsxSheetViews{SheetView: []xlsxSheetView{{}}}
	}
	ws.SheetViews.SheetView[len(ws.SheetViews.SheetView)-1].Pane = p
	if !(panes.Freeze) && !(panes.Split) {
		if len(ws.SheetViews.SheetView) > 0 {
			ws.SheetViews.SheetView[len(ws.SheetViews.SheetView)-1].Pane = nil
		}
	}
	var s []*xlsxSelection
	for _, p := range panes.Selection {
		s = append(s, &xlsxSelection{
			ActiveCell: p.ActiveCell,
			Pane:       p.Pane,
			SQRef:      p.SQRef,
		})
	}
	ws.SheetViews.SheetView[len(ws.SheetViews.SheetView)-1].Selection = s
	return nil
}

// SetPanes provides a function to create and remove freeze panes and split panes
// by given worksheet name and panes options.
//
// ActivePane defines the pane that is active. The possible values for this
// attribute are defined in the following table:
//
//	 Enumeration Value               | Description
//	---------------------------------+-------------------------------------------------------------
//	 bottomLeft (Bottom Left Pane)   | Bottom left pane, when both vertical and horizontal
//	                                 | splits are applied.
//	                                 |
//	                                 | This value is also used when only a horizontal split has
//	                                 | been applied, dividing the pane into upper and lower
//	                                 | regions. In that case, this value specifies the bottom
//	                                 | pane.
//	                                 |
//	 bottomRight (Bottom Right Pane) | Bottom right pane, when both vertical and horizontal
//	                                 | splits are applied.
//	                                 |
//	 topLeft (Top Left Pane)         | Top left pane, when both vertical and horizontal splits
//	                                 | are applied.
//	                                 |
//	                                 | This value is also used when only a horizontal split has
//	                                 | been applied, dividing the pane into upper and lower
//	                                 | regions. In that case, this value specifies the top pane.
//	                                 |
//	                                 | This value is also used when only a vertical split has
//	                                 | been applied, dividing the pane into right and left
//	                                 | regions. In that case, this value specifies the left pane
//	                                 |
//	 topRight (Top Right Pane)       | Top right pane, when both vertical and horizontal
//	                                 | splits are applied.
//	                                 |
//	                                 | This value is also used when only a vertical split has
//	                                 | been applied, dividing the pane into right and left
//	                                 | regions. In that case, this value specifies the right
//	                                 | pane.
//
// Pane state type is restricted to the values supported currently listed in the following table:
//
//	 Enumeration Value               | Description
//	---------------------------------+-------------------------------------------------------------
//	 frozen (Frozen)                 | Panes are frozen, but were not split being frozen. In
//	                                 | this state, when the panes are unfrozen again, a single
//	                                 | pane results, with no split.
//	                                 |
//	                                 | In this state, the split bars are not adjustable.
//	                                 |
//	 split (Split)                   | Panes are split, but not frozen. In this state, the split
//	                                 | bars are adjustable by the user.
//
// XSplit (Horizontal Split Position): Horizontal position of the split, in
// 1/20th of a point; 0 (zero) if none. If the pane is frozen, this value
// indicates the number of columns visible in the top pane.
//
// YSplit (Vertical Split Position): Vertical position of the split, in 1/20th
// of a point; 0 (zero) if none. If the pane is frozen, this value indicates the
// number of rows visible in the left pane. The possible values for this
// attribute are defined by the W3C XML Schema double datatype.
//
// TopLeftCell: Location of the top left visible cell in the bottom right pane
// (when in Left-To-Right mode).
//
// SQRef (Sequence of References): Range of the selection. Can be non-contiguous
// set of ranges.
//
// An example of how to freeze column A in the Sheet1 and set the active cell on
// Sheet1!K16:
//
//	err := f.SetPanes("Sheet1", &excelize.Panes{
//	    Freeze:      true,
//	    Split:       false,
//	    XSplit:      1,
//	    YSplit:      0,
//	    TopLeftCell: "B1",
//	    ActivePane:  "topRight",
//	    Selection: []excelize.Selection{
//	        {SQRef: "K16", ActiveCell: "K16", Pane: "topRight"},
//	    },
//	})
//
// An example of how to freeze rows 1 to 9 in the Sheet1 and set the active cell
// ranges on Sheet1!A11:XFD11:
//
//	err := f.SetPanes("Sheet1", &excelize.Panes{
//	    Freeze:      true,
//	    Split:       false,
//	    XSplit:      0,
//	    YSplit:      9,
//	    TopLeftCell: "A34",
//	    ActivePane:  "bottomLeft",
//	    Selection: []excelize.Selection{
//	        {SQRef: "A11:XFD11", ActiveCell: "A11", Pane: "bottomLeft"},
//	    },
//	})
//
// An example of how to create split panes in the Sheet1 and set the active cell
// on Sheet1!J60:
//
//	err := f.SetPanes("Sheet1", &excelize.Panes{
//	    Freeze:      false,
//	    Split:       true,
//	    XSplit:      3270,
//	    YSplit:      1800,
//	    TopLeftCell: "N57",
//	    ActivePane:  "bottomLeft",
//	    Selection: []excelize.Selection{
//	        {SQRef: "I36", ActiveCell: "I36"},
//	        {SQRef: "G33", ActiveCell: "G33", Pane: "topRight"},
//	        {SQRef: "J60", ActiveCell: "J60", Pane: "bottomLeft"},
//	        {SQRef: "O60", ActiveCell: "O60", Pane: "bottomRight"},
//	    },
//	})
//
// An example of how to unfreeze and remove all panes on Sheet1:
//
//	err := f.SetPanes("Sheet1", &excelize.Panes{Freeze: false, Split: false})
func (f *File) SetPanes(sheet string, panes *Panes) error {
	ws, err := f.workSheetReader(sheet)
	if err != nil {
		return err
	}
	return ws.setPanes(panes)
}

// getPanes returns freeze panes, split panes, and views of the worksheet.
func (ws *xlsxWorksheet) getPanes() Panes {
	var (
		panes   Panes
		section []Selection
	)
	if ws.SheetViews == nil || len(ws.SheetViews.SheetView) < 1 {
		return panes
	}
	sw := ws.SheetViews.SheetView[len(ws.SheetViews.SheetView)-1]
	for _, s := range sw.Selection {
		if s != nil {
			section = append(section, Selection{
				SQRef:      s.SQRef,
				ActiveCell: s.ActiveCell,
				Pane:       s.Pane,
			})
		}
	}
	panes.Selection = section
	if sw.Pane == nil {
		return panes
	}
	panes.ActivePane = sw.Pane.ActivePane
	if sw.Pane.State == "frozen" {
		panes.Freeze = true
	}
	panes.TopLeftCell = sw.Pane.TopLeftCell
	panes.XSplit = int(sw.Pane.XSplit)
	panes.YSplit = int(sw.Pane.YSplit)
	return panes
}

// GetPanes provides a function to get freeze panes, split panes, and worksheet
// views by given worksheet name.
func (f *File) GetPanes(sheet string) (Panes, error) {
	var panes Panes
	ws, err := f.workSheetReader(sheet)
	if err != nil {
		return panes, err
	}
	return ws.getPanes(), err
}

// GetSheetVisible provides a function to get worksheet visible by given worksheet
// name. For example, get visible state of Sheet1:
//
//	visible, err := f.GetSheetVisible("Sheet1")
func (f *File) GetSheetVisible(sheet string) (bool, error) {
	var visible bool
	if err := checkSheetName(sheet); err != nil {
		return visible, err
	}
	wb, _ := f.workbookReader()
	for k, v := range wb.Sheets.Sheet {
		if strings.EqualFold(v.Name, sheet) {
			if wb.Sheets.Sheet[k].State == "" || wb.Sheets.Sheet[k].State == "visible" {
				visible = true
			}
		}
	}
	return visible, nil
}

// SearchSheet provides a function to get cell reference by given worksheet name,
// cell value, and regular expression. The function doesn't support searching
// on the calculated result, formatted numbers and conditional lookup
// currently. If it is a merged cell, it will return the cell reference of the
// upper left cell of the merged range reference.
//
// An example of search the cell reference of the value of "100" on Sheet1:
//
//	result, err := f.SearchSheet("Sheet1", "100")
//
// An example of search the cell reference where the numerical value in the range
// of "0-9" of Sheet1 is described:
//
//	result, err := f.SearchSheet("Sheet1", "[0-9]", true)
func (f *File) SearchSheet(sheet, value string, reg ...bool) ([]string, error) {
	var (
		regSearch bool
		result    []string
	)
	if err := checkSheetName(sheet); err != nil {
		return result, err
	}
	for _, r := range reg {
		regSearch = r
	}
	name, ok := f.getSheetXMLPath(sheet)
	if !ok {
		return result, ErrSheetNotExist{sheet}
	}
	if ws, ok := f.Sheet.Load(name); ok && ws != nil {
		// Flush data
		output, _ := xml.Marshal(ws.(*xlsxWorksheet))
		f.saveFileList(name, f.replaceNameSpaceBytes(name, output))
	}
	return f.searchSheet(name, value, regSearch)
}

// searchSheet provides a function to get cell reference by given worksheet
// name, cell value, and regular expression.
func (f *File) searchSheet(name, value string, regSearch bool) (result []string, err error) {
	var (
		cellName, inElement string
		cellCol, row        int
		sst                 *xlsxSST
	)

	if sst, err = f.sharedStringsReader(); err != nil {
		return
	}
	regex := regexp.MustCompile(value)
	decoder := f.xmlNewDecoder(bytes.NewReader(f.readBytes(name)))
	for {
		var token xml.Token
		token, err = decoder.Token()
		if err != nil || token == nil {
			if err == io.EOF {
				err = nil
			}
			break
		}
		switch xmlElement := token.(type) {
		case xml.StartElement:
			inElement = xmlElement.Name.Local
			if inElement == "row" {
				row, err = attrValToInt("r", xmlElement.Attr)
				if err != nil {
					return
				}
			}
			if inElement == "c" {
				colCell := xlsxC{}
				_ = decoder.DecodeElement(&colCell, &xmlElement)
				val, _ := colCell.getValueFrom(f, sst, false)
				if regSearch {
					if !regex.MatchString(val) {
						continue
					}
				} else {
					if val != value {
						continue
					}
				}
				cellCol, _, err = CellNameToCoordinates(colCell.R)
				if err != nil {
					return result, err
				}
				cellName, err = CoordinatesToCellName(cellCol, row)
				if err != nil {
					return result, err
				}
				result = append(result, cellName)
			}
		default:
		}
	}
	return
}

// attrValToInt provides a function to convert the local names to an integer
// by given XML attributes and specified names.
func attrValToInt(name string, attrs []xml.Attr) (val int, err error) {
	for _, attr := range attrs {
		if attr.Name.Local == name {
			val, err = strconv.Atoi(attr.Value)
			if err != nil {
				return
			}
		}
	}
	return
}

// attrValToFloat provides a function to convert the local names to a float64
// by given XML attributes and specified names.
func attrValToFloat(name string, attrs []xml.Attr) (val float64, err error) {
	for _, attr := range attrs {
		if attr.Name.Local == name {
			val, err = strconv.ParseFloat(attr.Value, 64)
			if err != nil {
				return
			}
		}
	}
	return
}

// attrValToBool provides a function to convert the local names to a boolean
// by given XML attributes and specified names.
func attrValToBool(name string, attrs []xml.Attr) (val bool, err error) {
	for _, attr := range attrs {
		if attr.Name.Local == name {
			val, err = strconv.ParseBool(attr.Value)
			if err != nil {
				return
			}
		}
	}
	return
}

// SetHeaderFooter provides a function to set headers and footers by given
// worksheet name and the control characters.
//
// Headers and footers are specified using the following settings fields:
//
//	 Fields           | Description
//	------------------+-----------------------------------------------------------
//	 AlignWithMargins | Align header footer margins with page margins
//	 DifferentFirst   | Different first-page header and footer indicator
//	 DifferentOddEven | Different odd and even page headers and footers indicator
//	 ScaleWithDoc     | Scale header and footer with document scaling
//	 OddFooter        | Odd Page Footer, or primary Page Footer if 'DifferentOddEven' is 'false'
//	 OddHeader        | Odd Header, or primary Page Header if 'DifferentOddEven' is 'false'
//	 EvenFooter       | Even Page Footer
//	 EvenHeader       | Even Page Header
//	 FirstFooter      | First Page Footer
//	 FirstHeader      | First Page Header
//
// The following formatting codes can be used in 6 string type fields:
// OddHeader, OddFooter, EvenHeader, EvenFooter, FirstFooter, FirstHeader
//
//	 Formatting Code        | Description
//	------------------------+-------------------------------------------------------------------------
//	 &&                     | The character "&"
//	                        |
//	 &font-size             | Size of the text font, where font-size is a decimal font size in points
//	                        |
//	 &"font name,font type" | A text font-name string, font name, and a text font-type string,
//	                        | font type
//	                        |
//	 &"-,Regular"           | Regular text format. Toggles bold and italic modes to off
//	                        |
//	 &A                     | Current worksheet's tab name
//	                        |
//	 &B or &"-,Bold"        | Bold text format, from off to on, or vice versa. The default mode is off
//	                        |
//	 &D                     | Current date
//	                        |
//	 &C                     | Center section
//	                        |
//	 &E                     | Double-underline text format
//	                        |
//	 &F                     | Current workbook's file name
//	                        |
//	 &G                     | Drawing object as background (Use AddHeaderFooterImage)
//	                        |
//	 &H                     | Shadow text format
//	                        |
//	 &I or &"-,Italic"      | Italic text format
//	                        |
//	 &K                     | Text font color
//	                        |
//	                        | An RGB Color is specified as RRGGBB
//	                        |
//	                        | A Theme Color is specified as TTSNNN where TT is the theme color Id,
//	                        | S is either "+" or "-" of the tint/shade value, and NNN is the
//	                        | tint/shade value
//	                        |
//	 &L                     | Left section
//	                        |
//	 &N                     | Total number of pages
//	                        |
//	 &O                     | Outline text format
//	                        |
//	 &P[[+|-]n]             | Without the optional suffix, the current page number in decimal
//	                        |
//	 &R                     | Right section
//	                        |
//	 &S                     | Strike through text format
//	                        |
//	 &T                     | Current time
//	                        |
//	 &U                     | Single-underline text format. If double-underline mode is on, the next
//	                        | occurrence in a section specifier toggles double-underline mode to off;
//	                        | otherwise, it toggles single-underline mode, from off to on, or vice
//	                        | versa. The default mode is off
//	                        |
//	 &X                     | Superscript text format
//	                        |
//	 &Y                     | Subscript text format
//	                        |
//	 &Z                     | Current workbook's file path
//
// For example:
//
//	err := f.SetHeaderFooter("Sheet1", &excelize.HeaderFooterOptions{
//	    DifferentFirst:   true,
//	    DifferentOddEven: true,
//	    OddHeader:        "&R&P",
//	    OddFooter:        "&C&F",
//	    EvenHeader:       "&L&P",
//	    EvenFooter:       "&L&D&R&T",
//	    FirstHeader:      `&CCenter &"-,Bold"Bold&"-,Regular"HeaderU+000A&D`,
//	})
//
// This example shows:
//
// - The first page has its own header and footer
//
// - Odd and even-numbered pages have different headers and footers
//
// - Current page number in the right section of odd-page headers
//
// - Current workbook's file name in the center section of odd-page footers
//
// - Current page number in the left section of even-page headers
//
// - Current date in the left section and the current time in the right section
// of even-page footers
//
// - The text "Center Bold Header" on the first line of the center section of
// the first page, and the date on the second line of the center section of
// that same page
//
// - No footer on the first page
func (f *File) SetHeaderFooter(sheet string, opts *HeaderFooterOptions) error {
	ws, err := f.workSheetReader(sheet)
	if err != nil {
		return err
	}
	if opts == nil {
		ws.HeaderFooter = nil
		return err
	}

	v := reflect.ValueOf(*opts)
	// Check 6 string type fields: OddHeader, OddFooter, EvenHeader, EvenFooter,
	// FirstFooter, FirstHeader
	for i := 4; i < v.NumField()-1; i++ {
		if len(utf16.Encode([]rune(v.Field(i).String()))) > MaxFieldLength {
			return newFieldLengthError(v.Type().Field(i).Name)
		}
	}
	ws.HeaderFooter = &xlsxHeaderFooter{
		AlignWithMargins: opts.AlignWithMargins,
		DifferentFirst:   opts.DifferentFirst,
		DifferentOddEven: opts.DifferentOddEven,
		ScaleWithDoc:     opts.ScaleWithDoc,
		OddHeader:        opts.OddHeader,
		OddFooter:        opts.OddFooter,
		EvenHeader:       opts.EvenHeader,
		EvenFooter:       opts.EvenFooter,
		FirstFooter:      opts.FirstFooter,
		FirstHeader:      opts.FirstHeader,
	}
	return err
}

// GetHeaderFooter provides a function to get worksheet header and footer by
// given worksheet name.
func (f *File) GetHeaderFooter(sheet string) (*HeaderFooterOptions, error) {
	var opts *HeaderFooterOptions
	ws, err := f.workSheetReader(sheet)
	if err != nil {
		return opts, err
	}
	if ws.HeaderFooter == nil {
		return opts, err
	}
	opts = &HeaderFooterOptions{
		AlignWithMargins: ws.HeaderFooter.AlignWithMargins,
		DifferentFirst:   ws.HeaderFooter.DifferentFirst,
		DifferentOddEven: ws.HeaderFooter.DifferentOddEven,
		ScaleWithDoc:     ws.HeaderFooter.ScaleWithDoc,
		OddHeader:        ws.HeaderFooter.OddHeader,
		OddFooter:        ws.HeaderFooter.OddFooter,
		EvenHeader:       ws.HeaderFooter.EvenHeader,
		EvenFooter:       ws.HeaderFooter.EvenFooter,
		FirstHeader:      ws.HeaderFooter.FirstHeader,
		FirstFooter:      ws.HeaderFooter.FirstFooter,
	}
	return opts, err
}

// ProtectSheet provides a function to prevent other users from accidentally or
// deliberately changing, moving, or deleting data in a worksheet. The
// optional field AlgorithmName specified hash algorithm, support XOR, MD4,
// MD5, SHA-1, SHA2-56, SHA-384, and SHA-512 currently, if no hash algorithm
// specified, will be using the XOR algorithm as default. For example, protect
// Sheet1 with protection settings:
//
//	err := f.ProtectSheet("Sheet1", &excelize.SheetProtectionOptions{
//	    AlgorithmName:       "SHA-512",
//	    Password:            "password",
//	    SelectLockedCells:   true,
//	    SelectUnlockedCells: true,
//	    EditScenarios:       true,
//	})
func (f *File) ProtectSheet(sheet string, opts *SheetProtectionOptions) error {
	ws, err := f.workSheetReader(sheet)
	if err != nil {
		return err
	}
	if opts == nil {
		return ErrParameterInvalid
	}
	ws.SheetProtection = &xlsxSheetProtection{
		AutoFilter:          !opts.AutoFilter,
		DeleteColumns:       !opts.DeleteColumns,
		DeleteRows:          !opts.DeleteRows,
		FormatCells:         !opts.FormatCells,
		FormatColumns:       !opts.FormatColumns,
		FormatRows:          !opts.FormatRows,
		InsertColumns:       !opts.InsertColumns,
		InsertHyperlinks:    !opts.InsertHyperlinks,
		InsertRows:          !opts.InsertRows,
		Objects:             !opts.EditObjects,
		PivotTables:         !opts.PivotTables,
		Scenarios:           !opts.EditScenarios,
		SelectLockedCells:   !opts.SelectLockedCells,
		SelectUnlockedCells: !opts.SelectUnlockedCells,
		Sheet:               true,
		Sort:                !opts.Sort,
	}
	if opts.Password != "" {
		if opts.AlgorithmName == "" {
			ws.SheetProtection.Password = genSheetPasswd(opts.Password)
			return err
		}
		hashValue, saltValue, err := genISOPasswdHash(opts.Password, opts.AlgorithmName, "", int(sheetProtectionSpinCount))
		if err != nil {
			return err
		}
		ws.SheetProtection.Password = ""
		ws.SheetProtection.AlgorithmName = opts.AlgorithmName
		ws.SheetProtection.SaltValue = saltValue
		ws.SheetProtection.HashValue = hashValue
		ws.SheetProtection.SpinCount = int(sheetProtectionSpinCount)
	}
	return err
}

// UnprotectSheet provides a function to remove protection for a sheet,
// specified the second optional password parameter to remove sheet
// protection with password verification.
func (f *File) UnprotectSheet(sheet string, password ...string) error {
	ws, err := f.workSheetReader(sheet)
	if err != nil {
		return err
	}
	// password verification
	if len(password) > 0 {
		if ws.SheetProtection == nil {
			return ErrUnprotectSheet
		}
		if ws.SheetProtection.AlgorithmName == "" && ws.SheetProtection.Password != genSheetPasswd(password[0]) {
			return ErrUnprotectSheetPassword
		}
		if ws.SheetProtection.AlgorithmName != "" {
			// check with given salt value
			hashValue, _, err := genISOPasswdHash(password[0], ws.SheetProtection.AlgorithmName, ws.SheetProtection.SaltValue, ws.SheetProtection.SpinCount)
			if err != nil {
				return err
			}
			if ws.SheetProtection.HashValue != hashValue {
				return ErrUnprotectSheetPassword
			}
		}
	}
	ws.SheetProtection = nil
	return err
}

// checkSheetName check whether there are illegal characters in the sheet name.
// 1. Confirm that the sheet name is not empty
// 2. Make sure to enter a name with no more than 31 characters
// 3. Make sure the first or last character of the name cannot be a single quote
// 4. Verify that the following characters are not included in the name :\/?*[]
func checkSheetName(name string) error {
	if name == "" {
		return ErrSheetNameBlank
	}
	if utf8.RuneCountInString(name) > MaxSheetNameLength {
		return ErrSheetNameLength
	}
	if strings.HasPrefix(name, "'") || strings.HasSuffix(name, "'") {
		return ErrSheetNameSingleQuote
	}
	if strings.ContainsAny(name, ":\\/?*[]") {
		return ErrSheetNameInvalid
	}
	return nil
}

// SetPageLayout provides a function to sets worksheet page layout.
//
// The following shows the paper size sorted by excelize index number:
//
//	 Index | Paper Size
//	-------+-----------------------------------------------
//	   1   | Letter paper (8.5 in. by 11 in.)
//	   2   | Letter small paper (8.5 in. by 11 in.)
//	   3   | Tabloid paper (11 in. by 17 in.)
//	   4   | Ledger paper (17 in. by 11 in.)
//	   5   | Legal paper (8.5 in. by 14 in.)
//	   6   | Statement paper (5.5 in. by 8.5 in.)
//	   7   | Executive paper (7.25 in. by 10.5 in.)
//	   8   | A3 paper (297 mm by 420 mm)
//	   9   | A4 paper (210 mm by 297 mm)
//	   10  | A4 small paper (210 mm by 297 mm)
//	   11  | A5 paper (148 mm by 210 mm)
//	   12  | B4 paper (250 mm by 353 mm)
//	   13  | B5 paper (176 mm by 250 mm)
//	   14  | Folio paper (8.5 in. by 13 in.)
//	   15  | Quarto paper (215 mm by 275 mm)
//	   16  | Standard paper (10 in. by 14 in.)
//	   17  | Standard paper (11 in. by 17 in.)
//	   18  | Note paper (8.5 in. by 11 in.)
//	   19  | #9 envelope (3.875 in. by 8.875 in.)
//	   20  | #10 envelope (4.125 in. by 9.5 in.)
//	   21  | #11 envelope (4.5 in. by 10.375 in.)
//	   22  | #12 envelope (4.75 in. by 11 in.)
//	   23  | #14 envelope (5 in. by 11.5 in.)
//	   24  | C paper (17 in. by 22 in.)
//	   25  | D paper (22 in. by 34 in.)
//	   26  | E paper (34 in. by 44 in.)
//	   27  | DL envelope (110 mm by 220 mm)
//	   28  | C5 envelope (162 mm by 229 mm)
//	   29  | C3 envelope (324 mm by 458 mm)
//	   30  | C4 envelope (229 mm by 324 mm)
//	   31  | C6 envelope (114 mm by 162 mm)
//	   32  | C65 envelope (114 mm by 229 mm)
//	   33  | B4 envelope (250 mm by 353 mm)
//	   34  | B5 envelope (176 mm by 250 mm)
//	   35  | B6 envelope (176 mm by 125 mm)
//	   36  | Italy envelope (110 mm by 230 mm)
//	   37  | Monarch envelope (3.875 in. by 7.5 in.).
//	   38  | 6 3/4 envelope (3.625 in. by 6.5 in.)
//	   39  | US standard fanfold (14.875 in. by 11 in.)
//	   40  | German standard fanfold (8.5 in. by 12 in.)
//	   41  | German legal fanfold (8.5 in. by 13 in.)
//	   42  | ISO B4 (250 mm by 353 mm)
//	   43  | Japanese postcard (100 mm by 148 mm)
//	   44  | Standard paper (9 in. by 11 in.)
//	   45  | Standard paper (10 in. by 11 in.)
//	   46  | Standard paper (15 in. by 11 in.)
//	   47  | Invite envelope (220 mm by 220 mm)
//	   50  | Letter extra paper (9.275 in. by 12 in.)
//	   51  | Legal extra paper (9.275 in. by 15 in.)
//	   52  | Tabloid extra paper (11.69 in. by 18 in.)
//	   53  | A4 extra paper (236 mm by 322 mm)
//	   54  | Letter transverse paper (8.275 in. by 11 in.)
//	   55  | A4 transverse paper (210 mm by 297 mm)
//	   56  | Letter extra transverse paper (9.275 in. by 12 in.)
//	   57  | SuperA/SuperA/A4 paper (227 mm by 356 mm)
//	   58  | SuperB/SuperB/A3 paper (305 mm by 487 mm)
//	   59  | Letter plus paper (8.5 in. by 12.69 in.)
//	   60  | A4 plus paper (210 mm by 330 mm)
//	   61  | A5 transverse paper (148 mm by 210 mm)
//	   62  | JIS B5 transverse paper (182 mm by 257 mm)
//	   63  | A3 extra paper (322 mm by 445 mm)
//	   64  | A5 extra paper (174 mm by 235 mm)
//	   65  | ISO B5 extra paper (201 mm by 276 mm)
//	   66  | A2 paper (420 mm by 594 mm)
//	   67  | A3 transverse paper (297 mm by 420 mm)
//	   68  | A3 extra transverse paper (322 mm by 445 mm)
//	   69  | Japanese Double Postcard (200 mm x 148 mm)
//	   70  | A6 (105 mm x 148 mm)
//	   71  | Japanese Envelope Kaku #2
//	   72  | Japanese Envelope Kaku #3
//	   73  | Japanese Envelope Chou #3
//	   74  | Japanese Envelope Chou #4
//	   75  | Letter Rotated (11in x 8 1/2 11 in)
//	   76  | A3 Rotated (420 mm x 297 mm)
//	   77  | A4 Rotated (297 mm x 210 mm)
//	   78  | A5 Rotated (210 mm x 148 mm)
//	   79  | B4 (JIS) Rotated (364 mm x 257 mm)
//	   80  | B5 (JIS) Rotated (257 mm x 182 mm)
//	   81  | Japanese Postcard Rotated (148 mm x 100 mm)
//	   82  | Double Japanese Postcard Rotated (148 mm x 200 mm)
//	   83  | A6 Rotated (148 mm x 105 mm)
//	   84  | Japanese Envelope Kaku #2 Rotated
//	   85  | Japanese Envelope Kaku #3 Rotated
//	   86  | Japanese Envelope Chou #3 Rotated
//	   87  | Japanese Envelope Chou #4 Rotated
//	   88  | B6 (JIS) (128 mm x 182 mm)
//	   89  | B6 (JIS) Rotated (182 mm x 128 mm)
//	   90  | (12 in x 11 in)
//	   91  | Japanese Envelope You #4
//	   92  | Japanese Envelope You #4 Rotated
//	   93  | PRC 16K (146 mm x 215 mm)
//	   94  | PRC 32K (97 mm x 151 mm)
//	   95  | PRC 32K(Big) (97 mm x 151 mm)
//	   96  | PRC Envelope #1 (102 mm x 165 mm)
//	   97  | PRC Envelope #2 (102 mm x 176 mm)
//	   98  | PRC Envelope #3 (125 mm x 176 mm)
//	   99  | PRC Envelope #4 (110 mm x 208 mm)
//	   100 | PRC Envelope #5 (110 mm x 220 mm)
//	   101 | PRC Envelope #6 (120 mm x 230 mm)
//	   102 | PRC Envelope #7 (160 mm x 230 mm)
//	   103 | PRC Envelope #8 (120 mm x 309 mm)
//	   104 | PRC Envelope #9 (229 mm x 324 mm)
//	   105 | PRC Envelope #10 (324 mm x 458 mm)
//	   106 | PRC 16K Rotated
//	   107 | PRC 32K Rotated
//	   108 | PRC 32K(Big) Rotated
//	   109 | PRC Envelope #1 Rotated (165 mm x 102 mm)
//	   110 | PRC Envelope #2 Rotated (176 mm x 102 mm)
//	   111 | PRC Envelope #3 Rotated (176 mm x 125 mm)
//	   112 | PRC Envelope #4 Rotated (208 mm x 110 mm)
//	   113 | PRC Envelope #5 Rotated (220 mm x 110 mm)
//	   114 | PRC Envelope #6 Rotated (230 mm x 120 mm)
//	   115 | PRC Envelope #7 Rotated (230 mm x 160 mm)
//	   116 | PRC Envelope #8 Rotated (309 mm x 120 mm)
//	   117 | PRC Envelope #9 Rotated (324 mm x 229 mm)
//	   118 | PRC Envelope #10 Rotated (458 mm x 324 mm)
func (f *File) SetPageLayout(sheet string, opts *PageLayoutOptions) error {
	ws, err := f.workSheetReader(sheet)
	if err != nil {
		return err
	}
	if opts == nil {
		return err
	}
	return ws.setPageSetUp(opts)
}

// newPageSetUp initialize page setup settings for the worksheet if which not
// exist.
func (ws *xlsxWorksheet) newPageSetUp() {
	if ws.PageSetUp == nil {
		ws.PageSetUp = new(xlsxPageSetUp)
	}
}

// setPageSetUp set page setup settings for the worksheet by given options.
func (ws *xlsxWorksheet) setPageSetUp(opts *PageLayoutOptions) error {
	if opts.Size != nil {
		ws.newPageSetUp()
		ws.PageSetUp.PaperSize = opts.Size
	}
	if opts.Orientation != nil {
		if inStrSlice(supportedPageOrientation, *opts.Orientation, true) == -1 {
			return newInvalidPageLayoutValueError("Orientation", *opts.Orientation, strings.Join(supportedPageOrientation, ", "))
		}
		ws.newPageSetUp()
		ws.PageSetUp.Orientation = *opts.Orientation
	}
	if opts.FirstPageNumber != nil && *opts.FirstPageNumber > 0 {
		ws.newPageSetUp()
		ws.PageSetUp.FirstPageNumber = strconv.Itoa(int(*opts.FirstPageNumber))
		ws.PageSetUp.UseFirstPageNumber = true
	}
	if opts.AdjustTo != nil {
		if *opts.AdjustTo < 10 || 400 < *opts.AdjustTo {
			return ErrPageSetupAdjustTo
		}
		ws.newPageSetUp()
		ws.PageSetUp.Scale = int(*opts.AdjustTo)
	}
	if opts.FitToHeight != nil {
		ws.newPageSetUp()
		ws.PageSetUp.FitToHeight = opts.FitToHeight
	}
	if opts.FitToWidth != nil {
		ws.newPageSetUp()
		ws.PageSetUp.FitToWidth = opts.FitToWidth
	}
	if opts.BlackAndWhite != nil {
		ws.newPageSetUp()
		ws.PageSetUp.BlackAndWhite = *opts.BlackAndWhite
	}
	if opts.PageOrder != nil {
		if inStrSlice(supportedPageOrder, *opts.PageOrder, true) == -1 {
			return newInvalidPageLayoutValueError("PageOrder", *opts.PageOrder, strings.Join(supportedPageOrder, ", "))
		}
		ws.newPageSetUp()
		ws.PageSetUp.PageOrder = *opts.PageOrder
	}
	return nil
}

// GetPageLayout provides a function to gets worksheet page layout.
func (f *File) GetPageLayout(sheet string) (PageLayoutOptions, error) {
	opts := PageLayoutOptions{
		Size:            intPtr(0),
		Orientation:     stringPtr(supportedPageOrientation[0]),
		FirstPageNumber: uintPtr(1),
		AdjustTo:        uintPtr(100),
	}
	ws, err := f.workSheetReader(sheet)
	if err != nil {
		return opts, err
	}
	if ws.PageSetUp != nil {
		if ws.PageSetUp.PaperSize != nil {
			opts.Size = ws.PageSetUp.PaperSize
		}
		if ws.PageSetUp.Orientation != "" {
			opts.Orientation = stringPtr(ws.PageSetUp.Orientation)
		}
		if num, _ := strconv.Atoi(ws.PageSetUp.FirstPageNumber); num != 0 {
			opts.FirstPageNumber = uintPtr(uint(num))
		}
		if ws.PageSetUp.Scale >= 10 && ws.PageSetUp.Scale <= 400 {
			opts.AdjustTo = uintPtr(uint(ws.PageSetUp.Scale))
		}
		if ws.PageSetUp.FitToHeight != nil {
			opts.FitToHeight = ws.PageSetUp.FitToHeight
		}
		if ws.PageSetUp.FitToWidth != nil {
			opts.FitToWidth = ws.PageSetUp.FitToWidth
		}
		opts.BlackAndWhite = boolPtr(ws.PageSetUp.BlackAndWhite)
		if ws.PageSetUp.PageOrder != "" {
			opts.PageOrder = stringPtr(ws.PageSetUp.PageOrder)
		}
	}
	return opts, err
}

// SetDefinedName provides a function to set the defined names of the workbook
// or worksheet. If not specified scope, the default scope is workbook.
// For example:
//
//	err := f.SetDefinedName(&excelize.DefinedName{
//	    Name:     "Amount",
//	    RefersTo: "Sheet1!$A$2:$D$5",
//	    Comment:  "defined name comment",
//	    Scope:    "Sheet2",
//	})
//
// If you fill the RefersTo property with only one columns range without a
// comma, it will work as "Columns to repeat at left" only. For example:
//
//	err := f.SetDefinedName(&excelize.DefinedName{
//	    Name:     "_xlnm.Print_Titles",
//	    RefersTo: "Sheet1!$A:$A",
//	    Scope:    "Sheet1",
//	})
//
// If you fill the RefersTo property with only one rows range without a comma,
// it will work as "Rows to repeat at top" only. For example:
//
//	err := f.SetDefinedName(&excelize.DefinedName{
//	    Name:     "_xlnm.Print_Titles",
//	    RefersTo: "Sheet1!$1:$1",
//	    Scope:    "Sheet1",
//	})
func (f *File) SetDefinedName(definedName *DefinedName) error {
	if definedName.Name == "" || definedName.RefersTo == "" {
		return ErrParameterInvalid
	}
	if err := checkDefinedName(definedName.Name); err != nil && inStrSlice(builtInDefinedNames[:2], definedName.Name, false) == -1 {
		return err
	}
	wb, err := f.workbookReader()
	if err != nil {
		return err
	}
	d := xlsxDefinedName{
		Name:    definedName.Name,
		Comment: definedName.Comment,
		Data:    definedName.RefersTo,
	}
	if definedName.Scope != "" {
		if sheetIndex, _ := f.GetSheetIndex(definedName.Scope); sheetIndex >= 0 {
			d.LocalSheetID = &sheetIndex
		}
	}
	if wb.DefinedNames != nil {
		for _, dn := range wb.DefinedNames.DefinedName {
			var scope string
			if dn.LocalSheetID != nil {
				scope = f.GetSheetName(*dn.LocalSheetID)
			}
			if scope == definedName.Scope && dn.Name == definedName.Name {
				return ErrDefinedNameDuplicate
			}
		}
		wb.DefinedNames.DefinedName = append(wb.DefinedNames.DefinedName, d)
		return nil
	}
	wb.DefinedNames = &xlsxDefinedNames{
		DefinedName: []xlsxDefinedName{d},
	}
	return nil
}

// DeleteDefinedName provides a function to delete the defined names of the
// workbook or worksheet. If not specified scope, the default scope is
// workbook. For example:
//
//	err := f.DeleteDefinedName(&excelize.DefinedName{
//	    Name:     "Amount",
//	    Scope:    "Sheet2",
//	})
func (f *File) DeleteDefinedName(definedName *DefinedName) error {
	wb, err := f.workbookReader()
	if err != nil {
		return err
	}
	if wb.DefinedNames != nil {
		for idx, dn := range wb.DefinedNames.DefinedName {
			scope := "Workbook"
			deleteScope := definedName.Scope
			if deleteScope == "" {
				deleteScope = "Workbook"
			}
			if dn.LocalSheetID != nil {
				scope = f.GetSheetName(*dn.LocalSheetID)
			}
			if scope == deleteScope && dn.Name == definedName.Name {
				wb.DefinedNames.DefinedName = append(wb.DefinedNames.DefinedName[:idx], wb.DefinedNames.DefinedName[idx+1:]...)
				return err
			}
		}
	}
	return ErrDefinedNameScope
}

// GetDefinedName provides a function to get the defined names of the workbook
// or worksheet.
func (f *File) GetDefinedName() []DefinedName {
	var definedNames []DefinedName
	wb, _ := f.workbookReader()
	if wb.DefinedNames != nil {
		for _, dn := range wb.DefinedNames.DefinedName {
			definedName := DefinedName{
				Name:     dn.Name,
				Comment:  dn.Comment,
				RefersTo: dn.Data,
				Scope:    "Workbook",
			}
			if dn.LocalSheetID != nil && *dn.LocalSheetID >= 0 {
				definedName.Scope = f.GetSheetName(*dn.LocalSheetID)
			}
			definedNames = append(definedNames, definedName)
		}
	}
	return definedNames
}

// GroupSheets provides a function to group worksheets by given worksheets
// name. Group worksheets must contain an active worksheet.
func (f *File) GroupSheets(sheets []string) error {
	// Check an active worksheet in group worksheets
	var inActiveSheet bool
	activeSheet := f.GetActiveSheetIndex()
	sheetMap := f.GetSheetList()
	for idx, sheetName := range sheetMap {
		for _, s := range sheets {
			if strings.EqualFold(s, sheetName) && idx == activeSheet {
				inActiveSheet = true
			}
		}
	}
	if !inActiveSheet {
		return ErrGroupSheets
	}
	// check worksheet exists
	var wss []*xlsxWorksheet
	for _, sheet := range sheets {
		worksheet, err := f.workSheetReader(sheet)
		if err != nil {
			return err
		}
		wss = append(wss, worksheet)
	}
	for _, ws := range wss {
		sheetViews := ws.SheetViews.SheetView
		for idx := range sheetViews {
			ws.SheetViews.SheetView[idx].TabSelected = true
		}
	}
	return nil
}

// UngroupSheets provides a function to ungroup worksheets.
func (f *File) UngroupSheets() error {
	activeSheet := f.GetActiveSheetIndex()
	for index, sheet := range f.GetSheetList() {
		if activeSheet == index {
			continue
		}
		ws, _ := f.workSheetReader(sheet)
		sheetViews := ws.SheetViews.SheetView
		for idx := range sheetViews {
			ws.SheetViews.SheetView[idx].TabSelected = false
		}
	}
	return nil
}

// InsertPageBreak create a page break to determine where the printed page
// ends and where begins the next one by given worksheet name and cell
// reference, so the content before the page break will be printed on one page
// and after the page break on another.
func (f *File) InsertPageBreak(sheet, cell string) error {
	ws, err := f.workSheetReader(sheet)
	if err != nil {
		return err
	}
	return ws.insertPageBreak(cell)
}

// insertPageBreak create a page break in the worksheet by specific cell
// reference.
func (ws *xlsxWorksheet) insertPageBreak(cell string) error {
	var (
		row, col       int
		err            error
		rowBrk, colBrk = -1, -1
	)
	if col, row, err = CellNameToCoordinates(cell); err != nil {
		return err
	}
	col--
	row--
	if col == row && col == 0 {
		return err
	}
	if ws.RowBreaks == nil {
		ws.RowBreaks = &xlsxRowBreaks{}
	}
	if ws.ColBreaks == nil {
		ws.ColBreaks = &xlsxColBreaks{}
	}

	for idx, brk := range ws.RowBreaks.Brk {
		if brk.ID == row {
			rowBrk = idx
		}
	}
	for idx, brk := range ws.ColBreaks.Brk {
		if brk.ID == col {
			colBrk = idx
		}
	}

	if row != 0 && rowBrk == -1 {
		ws.RowBreaks.Brk = append(ws.RowBreaks.Brk, &xlsxBrk{
			ID:  row,
			Max: MaxColumns - 1,
			Man: true,
		})
		ws.RowBreaks.ManualBreakCount++
	}
	if col != 0 && colBrk == -1 {
		ws.ColBreaks.Brk = append(ws.ColBreaks.Brk, &xlsxBrk{
			ID:  col,
			Max: TotalRows - 1,
			Man: true,
		})
		ws.ColBreaks.ManualBreakCount++
	}
	ws.RowBreaks.Count = len(ws.RowBreaks.Brk)
	ws.ColBreaks.Count = len(ws.ColBreaks.Brk)
	return err
}

// RemovePageBreak remove a page break by given worksheet name and cell
// reference.
func (f *File) RemovePageBreak(sheet, cell string) error {
	var (
		ws       *xlsxWorksheet
		row, col int
		err      error
	)
	if ws, err = f.workSheetReader(sheet); err != nil {
		return err
	}
	if col, row, err = CellNameToCoordinates(cell); err != nil {
		return err
	}
	col--
	row--
	if col == row && col == 0 {
		return err
	}
	removeBrk := func(ID int, brks []*xlsxBrk) []*xlsxBrk {
		for i, brk := range brks {
			if brk.ID == ID {
				brks = append(brks[:i], brks[i+1:]...)
			}
		}
		return brks
	}
	if ws.RowBreaks == nil || ws.ColBreaks == nil {
		return err
	}
	rowBrks := len(ws.RowBreaks.Brk)
	colBrks := len(ws.ColBreaks.Brk)
	if rowBrks > 0 && rowBrks == colBrks {
		ws.RowBreaks.Brk = removeBrk(row, ws.RowBreaks.Brk)
		ws.ColBreaks.Brk = removeBrk(col, ws.ColBreaks.Brk)
		ws.RowBreaks.Count = len(ws.RowBreaks.Brk)
		ws.ColBreaks.Count = len(ws.ColBreaks.Brk)
		ws.RowBreaks.ManualBreakCount--
		ws.ColBreaks.ManualBreakCount--
		return err
	}
	if rowBrks > 0 && rowBrks > colBrks {
		ws.RowBreaks.Brk = removeBrk(row, ws.RowBreaks.Brk)
		ws.RowBreaks.Count = len(ws.RowBreaks.Brk)
		ws.RowBreaks.ManualBreakCount--
		return err
	}
	if colBrks > 0 && colBrks > rowBrks {
		ws.ColBreaks.Brk = removeBrk(col, ws.ColBreaks.Brk)
		ws.ColBreaks.Count = len(ws.ColBreaks.Brk)
		ws.ColBreaks.ManualBreakCount--
	}
	return err
}

// relsReader provides a function to get the pointer to the structure
// after deserialization of relationships parts.
func (f *File) relsReader(path string) (*xlsxRelationships, error) {
	rels, _ := f.Relationships.Load(path)
	if rels == nil {
		if _, ok := f.Pkg.Load(path); ok {
			c := xlsxRelationships{}
			if err := f.xmlNewDecoder(bytes.NewReader(namespaceStrictToTransitional(f.readXML(path)))).
				Decode(&c); err != nil && err != io.EOF {
				return nil, err
			}
			f.Relationships.Store(path, &c)
		}
	}
	if rels, _ = f.Relationships.Load(path); rels != nil {
		return rels.(*xlsxRelationships), nil
	}
	return nil, nil
}

// fillSheetData ensures there are enough rows, and columns in the chosen
// row to accept data. Missing rows are backfilled and given their row number
// Uses the last populated row as a hint for the size of the next row to add
func (ws *xlsxWorksheet) prepareSheetXML(col int, row int) {
	rowCount := len(ws.SheetData.Row)
	sizeHint := 0
	var ht *float64
	var customHeight bool
	if ws.SheetFormatPr != nil && ws.SheetFormatPr.CustomHeight {
		ht = float64Ptr(ws.SheetFormatPr.DefaultRowHeight)
		customHeight = true
	}
	if rowCount > 0 {
		sizeHint = len(ws.SheetData.Row[rowCount-1].C)
	}
	if rowCount < row {
		// append missing rows
		for rowIdx := rowCount; rowIdx < row; rowIdx++ {
			ws.SheetData.Row = append(ws.SheetData.Row, xlsxRow{R: rowIdx + 1, CustomHeight: customHeight, Ht: ht, C: make([]xlsxC, 0, sizeHint)})
		}
	}
	rowData := &ws.SheetData.Row[row-1]
	fillColumns(rowData, col, row)
}

// fillColumns fill cells in the column of the row as contiguous.
func fillColumns(rowData *xlsxRow, col, row int) {
	cellCount := len(rowData.C)
	if cellCount < col {
		for colIdx := cellCount; colIdx < col; colIdx++ {
			cellName, _ := CoordinatesToCellName(colIdx+1, row)
			rowData.C = append(rowData.C, xlsxC{R: cellName})
		}
	}
}

// makeContiguousColumns make columns in specific rows as contiguous.
func (ws *xlsxWorksheet) makeContiguousColumns(fromRow, toRow, colCount int) {
	for ; fromRow < toRow; fromRow++ {
		rowData := &ws.SheetData.Row[fromRow-1]
		fillColumns(rowData, colCount, fromRow)
	}
}

// SetSheetDimension provides the method to set or remove the used range of the
// worksheet by a given range reference. It specifies the row and column bounds
// of used cells in the worksheet. The range reference is set using the A1
// reference style(e.g., "A1:D5"). Passing an empty range reference will remove
// the used range of the worksheet.
func (f *File) SetSheetDimension(sheet string, rangeRef string) error {
	ws, err := f.workSheetReader(sheet)
	if err != nil {
		return err
	}
	// Remove the dimension element if an empty string is provided
	if rangeRef == "" {
		ws.Dimension = nil
		return nil
	}
	parts := len(strings.Split(rangeRef, ":"))
	if parts == 1 {
		_, _, err = CellNameToCoordinates(rangeRef)
		if err == nil {
			ws.Dimension = &xlsxDimension{Ref: strings.ToUpper(rangeRef)}
		}
		return err
	}
	if parts != 2 {
		return ErrParameterInvalid
	}
	coordinates, err := rangeRefToCoordinates(rangeRef)
	if err != nil {
		return err
	}
	_ = sortCoordinates(coordinates)
	ref, err := coordinatesToRangeRef(coordinates)
	ws.Dimension = &xlsxDimension{Ref: ref}
	return err
}

// GetSheetDimension provides the method to get the used range of the worksheet.
func (f *File) GetSheetDimension(sheet string) (string, error) {
	var ref string
	ws, err := f.workSheetReader(sheet)
	if err != nil {
		return ref, err
	}
	if ws.Dimension != nil {
		ref = ws.Dimension.Ref
	}
	return ref, err
}